Revert of Move RtcEventLog object from inside VoiceEngine to Call.

webrtc/media/base/mediaengine.h

Index: webrtc/media/base/mediaengine.h
diff --git a/webrtc/media/base/mediaengine.h b/webrtc/media/base/mediaengine.h
index dd1f5272a067dc21599eef469e71364ef9035ac7..0e2b7efa86e2dd8e1769e384dfd27d50a7cc3652 100644
--- a/webrtc/media/base/mediaengine.h
+++ b/webrtc/media/base/mediaengine.h
@@ -88,6 +88,15 @@
 
   // Stops recording AEC dump.
   virtual void StopAecDump() = 0;
+
+  // Starts RtcEventLog using existing file. A maximum file size in bytes can be
+  // specified. Logging is stopped just before the size limit is exceeded.
+  // If max_size_bytes is set to a value <= 0, no limit will be used.
+  virtual bool StartRtcEventLog(rtc::PlatformFile file,
+                                int64_t max_size_bytes) = 0;
+
+  // Stops recording an RtcEventLog.
+  virtual void StopRtcEventLog() = 0;
 };
 
 
@@ -166,6 +175,13 @@
     voice_.StopAecDump();
   }
 
+  virtual bool StartRtcEventLog(rtc::PlatformFile file,
+                                int64_t max_size_bytes) {
+    return voice_.StartRtcEventLog(file, max_size_bytes);
+  }
+
+  virtual void StopRtcEventLog() { voice_.StopRtcEventLog(); }
+
  protected:
   VOICE voice_;
   VIDEO video_;